A large sample confidence inerval for the log of the relative risk is: CI = log(p1/p2)+-Z(alpha/2)sqrt[(1-p1/n1p1)+(1-p2/n2p2) Antilogs of the endpoints yield an interval for the true relative risk. Verify the 95% CI of (1.43, 2.30) reported for  the relative risk in the following table (aspin and heart attack study):   myocardial infarction+ Myocardial infarction - total aspirin 189 10845 11034 placebo 104 10933 11037 total 293 21778 22071

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